FREEMAN, B. G. (1993). Management In Engineering Principles And Practice Gail Freeman Bell, James Blackwill. s.n.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFREEMAN, Bell Gail. Management In Engineering Principles And Practice Gail Freeman Bell, James Blackwill. s.n, 1993.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFREEMAN, Bell Gail. Management In Engineering Principles And Practice Gail Freeman Bell, James Blackwill. s.n, 1993.
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